Originally Posted by
seattlebruce
But she didn't book a different flight; she bought a ticket for a flight that OP said DL "sent her a confirmation emal" for -- after Korean couldn't find the booking. If she really was confirmed (as opposed to, say, offered the option of choosing it), then the fact that she says Korean couldn't find the booking, and her proof that she paid for a new ticket on that flight, ought to get the new one refunded. Of course that doesn't answer OP's question of how to obtain that refund, but it addreses your point.
What I meant was that she booked a different TICKET on the same flight, rather than getting the original ticket straightened out.
But maybe I'm being a bit hard on her, as it's understandable that it was probably a confusing situation. Not sure what differences there were between the two tickets.